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Treating Baled Wheat Straw with Urea is better than Treating Chopped Wheat Straw with UreaTaimour Tanha1, Ehsan Ehsan Mahjobi2, Ali Ali31University of Paiamnoor Tehran, Animal Science, Iran
AbstractThis study was conducted to test the simplicity of treating wheat straw with urea. Wheat straw was prepared in two physical forms including chopped straw (ChS) and baled form (BS). then it was sprayed with urea mixed water in amount of 5% urea and 100 liters of water per 100 kg of straw (DM basis). After 4 weeks the treated straw as well as initial straw (IS) were sampled for in vitro measurements. The in vitro digestibility was determined for DM and OM. In sacco degradability was measured, using of 3 fistulated male cows. Results indicated that treatment significantly (p<0.05) increased the DM and OM digestibility of the straw. The degradability of DM in 8, 16, 24 and 72 h post incubation was significantly (p<0.05) higher in treated straw than the IS. The gas test method was used to measure the gas production of the samples where the treated straw showed significantly (p<0.05) higher amount of gas yield after 2, 4, 6, 8, 12 and 24 h of incubation. In a feeding trial, 3 diets contained 40% of IS, ChS or BS, respectively, were fed to Holstein male calves (6 head per diet) for 4 months when the DM intake and daily gain were recorded and in vivo DM digestibility of the diets was measured. Results showed that the DM intake and average daily gain were significant (p<0.05) different among the diets, but no significantly differences was observed for the DM digestibility of the diets. Economic estimation showed that the feed cost per kg of live weight gain was 13104 Rial for normal straw diet while 12194 Rial for baled treated straw diet.
Keywords: Baled straw, chopped straw, degradability, Wheat straw Contact Address: Taimour Tanha, University of Paiamnoor Tehran, Animal Science, Pardis Nakhlestan 3 13.1, Tehran, Iran, e-mail: taimour.tanha 
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